Camelbak MIL SPEC Antidote Accessory Reservoir -The new Mil Spec Antidote Reservoir with Quick Link™ System-- the ultimate cure for dehydration.Quick Link™ Exit Port and QL HydroLock™ Bite Valve Adapter: tube clicks off for faster refilling with auto shut-offNew Fillport: industry's largest opening with air-light ¼ turn open/close for quick, secure seal that can't be over-tightened; lighter weight lower profile designLow-profile, baffled design reduces reservoir stack and maximizes stabilityQL HydroLock™ offers easy, one-handed on/off water flow on drink tubeQuick Link™ and QL HydroLock™ drink tube: quickly and easily attach any CPC accessory including the USMC standard filterInsulated drink tube cover protects tube from harmful UV rays and abrasion100% Free of BPA and BPSMaterials: .016 in [0.41 mm] thermoplastic polyurethane film > Engineering thermoplastic handle > 42 in (1067 mm) PureFlow™ Tube; 40 in (1016 mm) Tube Cover; Black Big Bite™ Valve; Black HydroLink™ HydroLock™ BPA Free